/Engine/Plugins/Runtime/Metasound/Source/MetasoundFrontend/Public/MetasoundFrontendDocumentBuilder.h
bool SetGraphInputDefault ( [FName](API\Runtime\Core\UObject\FName) InputName, const [FMetasoundFrontendLiteral](API\Plugins\MetasoundFrontend\FMetasoundFrontendLiteral) & InDefaultLiteral )